Auxiliary exhaust-valve for internal-combustion engines.



L. S. EGLINTON. AUXILIARY EXHAUST VALVE'FOR INTERNAL comsusnou ENGINES. 'APPLICATION FILED JULY 18, 1914.

06,520. PatentedNov. 28,1916. I [27.4

AUXILIARY'EXHAUSTVALVE FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Nov. 28, 193ll6.

Application filed July 18, 1914. Serial No. 851,757.

ments in Auxiliary Exhaust-Valves for Internal-Combustion Engines, of which the following is a specification.

My invention relates to an improvement in auxiliary exhaust valves for internal combustion engines, and includes those constructional details which are necessary and essential to give effect to the nature and principle of my invention, the special object of which .is to provide in internal combustion engines an auxiliary port and valve arranged in such a manner that the piston will open said port when it reaches the bottom of its stroke.

The valve is automatic in its action, and is blown open by the force of the firing charge immediately the port is opened by the descending piston, the valve being spring governed so that it automatically returns to its required position.

The valve is made with a separate or loose head into which the valve stem or spindle fits, all necessary details of construction being provided to enable the principal feature of my invention to perform its proper functions.

In order thatmy invention may be clearly understootl I will now refer to the accomdevice, Fig. 2 is a sectional plan of Fig. 1,.

Fig. 3 is an end view of valve and loose stem or spindle, Fig. 4 a section through valve showing stem or spindle in position, and Fig. 5 front View of exhaust chamber showing arrangement of bridge piece and divided port.

In each of the illustrations similar letters of reference are used to denote similar or corresponding parts wherever they occur.

In the drawings a represents a portion of the cylinder casting in which the operating piston 6 works in the ordinary manner. At a position substantially at the end of the stroke 1 form an auxiliary port 0 Preferably made as a double port supported by a bridge piece such as d. In the main casting I form an exhaust chamber such as e for the reception of the waste gases, and against the opening of this chamber I mount a valve plate and seating such as .f, which is covered in by the valve chamber 9 which is preferably made of cast metal, and is furnished with an internal valve spindle guide it as will be well understood on reference to Figs. 1 and 2 of the drawings.

The valve head is shownat j and is particularly characterized in its construction by the formation of a recess for the reception of a loose but well fitting valve stem or spindle I have found after considerable experiment that a combined valve and spin dle in which the spindle is a fixture will not give satisfactory results in actual work, and that the inconvenience caused by frequent breakage of the high speed valve for the purpose indicated is overcome by making the valve stem or spindle separate and de tachable therefrom. The stem or spindle is formed with an extension Z of less diameter than the main portion, a shoulder being formed at m for the retention of the spring carrier a.

I also provide a recessed washer 0, and between the spring carrier andkgthe washer a well tempered coil spring 7) is inserted, the parts being held in place by the end plate q, which in turn is secured in position by the studs 9", which are furnished with nuts and washers in the ordinary manner, and for the purposes of safety I insert a split pin at s in the end of the spindle extension. All these appliances are held to the main cylinder by means of the main studs t, and the valve chamber is furnished with an exhaust pipe at of any length of shape which may be convenient for the nature of the engine to which it is to be applied.

The action of my invention is as follows :--After the charge has exploded the piston descends, and as it approaches the bottom of the stroke it automatically exposes the auxiliary port, and enables the waste gases or product of the explosion to pass from thefeeylinder through the exhaust chamber, and'iby forcing the valve back against the pressure of the spring-the waste products escape through the valve chamber into the exhaust pipe from whence they are finally discharged; By this means the cylinder is relieved and cooled, and the action of the spring promptly closes the aperture before the next charge enters the cylinder.

I find by experiment and practice that if a valve of ordinary design is used for this wprk there is great danger of breaking the spindle, and if the spindle is dispensed i the cylinders of motor bicycles, but can also be applied to other high speed internal combustion engines.

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed,I declare that what I claim is 1. Auxiliary exhaust valve mechanism for internal combustion engines having an auxiliary exhaust port, said mechanism comprising a perforated boss surrounding said port, an exhaust casing having a lateral opening and secured to said boss, a valve seat rigidly held between the boss and the casing, an auxiliary exhaust valve fitted to said valve seat and having a recess in one side, a valve stem loosely seated in said recess and extending through said casing to the outside thereof, and spring means exteriorly of the casing adapted to engage said stem and normally hold said valve to its seat and also permit unseating of the same by exhaust pressure from the interior of the engine cylinder.

2. Auxiliary exhaust valve mechanism for internal combustion engines having an auxiliary exhaust port, said mechanism comprising an enlarged chamber surrounding said port, an exhaust valve casing rigidly secured to said enlarged chamber, a valve seat rigidly held between said chamber and casing and projecting into the casing, an auxiliary exhaust valve head fitted to the valve seat and having a recess in one side thereof, a valve stem loosely seated in said recess and extending through said casing to the outside thereof, and spring means exteriorly of the casing adapted to engage said stem and normally hold said valve to its seat and also to said spindle outside the casing and a permit the unseating of the same by exhaust pressure from the interior of the cylinder.

3. Auxiliary exhaust valve mechanism for internal combustion engines having a didivided auxiliary exhaust port adjacent one endot the engine cylinder, said mechanism comprising an auxiliary casing secured to the engine cylinder, a valve seatv projecting within said casing and rigidly but removably held between the casing and the engine cylinder, a valve head having a recess in one face and fitted to the said valve seat, a tubular guide within the casing, a valve stem loosely engaging at one end the recess in the valve head and its opposite end passing through said tubular guide to the exterior of the casing, a coiled spring surrounding V yoke secured to the casing and exteriorly thereof for holding said spring in place to engage the aforesaid stem, whereby the valve head will be normally held to its seat but permitted to unseat by exhaust pressure from Within the engine cylinder.

4. Auxiliary'exhaust valve mechanism for internal combustion engines having an auxiliary exhaust port adjacent the lower end of the engine cylinder, said mechanism consisting of an exhaust easing detachably secured to the cylinder and controlling the auxiliary exhaust port, a valve seat removably held between said casing and the engine cylinder, a tubular guide within the casing, a valve head engaging said valve seat, a valve stem loosely engaging at one end the valve head LINDSAY STEWART EGLINTON.

Witnesses JOHN HUBERT CooKE, JOHN MITCHELL SINCLAIR QUIN. 

